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Last change
on this file since 1242 was
38,
checked in by emillour, 14 years ago
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Ajout du modè Martien (mon LMDZ.MARS.BETA, du 28/01/2011) dans le rértoire mars, pour pouvoir suivre plus facilement les modifs.
EM
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File size:
1.1 KB
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| 1 | c****************************************************** |
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| 2 | SUBROUTINE intrplf(x,y,xd,yd,nd) |
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| 3 | c interpolation, give y = f(x) with array xd,yd known, size nd |
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| 4 | |
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| 5 | c Version with CONSTANT values outside limits |
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| 6 | c********************************************************** |
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| 7 | |
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| 8 | c Variable declaration |
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| 9 | c -------------------- |
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| 10 | c Arguments : |
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| 11 | real x,y |
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| 12 | real xd(nd),yd(nd) |
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| 13 | integer nd |
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| 14 | c internal |
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| 15 | integer i,j |
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| 16 | real y_undefined |
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| 17 | |
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| 18 | c run |
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| 19 | c --- |
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| 20 | y_undefined=1.e20 |
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| 21 | |
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| 22 | y=0. |
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| 23 | if ((x.le.xd(1)).and.(x.le.xd(nd))) then |
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| 24 | if (xd(1).lt.xd(nd)) y = yd(1) ! yd(1) |
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| 25 | if (xd(1).ge.xd(nd)) y = yd(nd) ! yd(1) |
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| 26 | else if ((x.ge.xd(1)).and.(x.ge.xd(nd))) then |
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| 27 | if (xd(1).lt.xd(nd)) y = yd(nd) ! yd(1) |
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| 28 | if (xd(1).ge.xd(nd)) y = yd(1) ! yd(1) |
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| 29 | c y = yd (nd) |
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| 30 | else |
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| 31 | do i=1,nd-1 |
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| 32 | if ( ( (x.ge.xd(i)).and.(x.lt.xd(i+1)) ) |
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| 33 | & .or. ( (x.le.xd(i)).and.(x.gt.xd(i+1)) ) ) then |
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| 34 | y=yd(i)+(x-xd(i))*(yd(i+1)-yd(i))/(xd(i+1)-xd(i)) |
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| 35 | goto 99 |
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| 36 | end if |
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| 37 | end do |
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| 38 | end if |
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| 39 | |
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| 40 | 99 continue |
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| 41 | return |
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| 42 | end |
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